Freeze Protection System With Drainage Control For Heat Transfer Coils in HVAC Systems

摘要

A pressure and/or temperature relief header for use in an HVAC heat transfer coil includes a main body adapted to he secured to bends in fluid coils of the HVAC fluid tube system, The main body includes holes in alignment with holes formed in the bends to enable liquid to pass from the bends into the expansion relief header. The expansion relief headers include a pressure release valve that automatically opens, preferably in response to pressure exceeding a predetermined threshold value or temperature falling -below a predetermined value, to release liquid from the expansion relief header and then reseats. A discharge housing collects liquid released through the pressure release valve. A sensor detects the presence of liquid in the discharge housing.

主权项

1. A method of protecting an HVAC heat transfer coil, wherein the coil comprises a plurality of liquid tubes and a plurality of bends to connect ends of adjacent liquid tubes together to form a liquid passage therebetween;
the method comprising: permitting liquid to escape from the bends into one or more expansion relief headers through aligned holes in the bends and in the expansion relief header; releasing liquid from the at least one expansion relief header by a pressure relief valve in communication with at least one of the one or more expansion relief headers automatically opening when a pressure within the expansion relief header exceeds a predetermined value; collecting liquid released from the at least one expansion relief header by the pressure relief valve in a discharge housing; and detecting the presence of liquid in the discharge housing by a sensor.